Nov 4: Section 5.1. The lecture demo site on the theremin has a link to more theremin references, including audio samples, and this is a movie of a theremin player.
Nov 6 Sections 5.1, 5.2. Spectra of modulated signals
Nov 11 Sections 5.2, 5.3. We showed an old synthesizer, learned the meaning of decibels (at least, of "3 dB"), looked at the signal produced by FM by feedback.